3.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
commit c15d821ddb9dac9ac6b5beb75bf942f3bc3a4004 upstream.
Fix code when the operation region callback is for an gpio, which
is not at index 0 and for partial pins in a GPIO definition.
For example:
Name (GMOD, ResourceTemplate ()
{
//3 Outputs that define the Power mode of the device
GpioIo (Exclusive, PullDown, , , , "\\_SB.GPI2") {10, 11, 12}
})
}
If opregion callback calls is for:
- Set pin 10, then address = 0 and bit length = 1
- Set pin 11, then address = 1 and bit length = 1
- Set for both pin 11 and pin 12, then address = 1, bit length = 2
This change requires updated ACPICA gpio operation handler code to
send the pin index and bit length.
Fixes: 473ed7be0da0 (gpio / ACPI: Add support for ACPI GPIO operation regions)
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpio/gpiolib-acpi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -357,8 +357,10 @@ acpi_gpio_adr_space_handler(u32 function
struct gpio_chip *chip = achip->chip;
struct acpi_resource_gpio *agpio;
struct acpi_resource *ares;
+ int pin_index = (int)address;
acpi_status status;
bool pull_up;
+ int length;
int i;
status = acpi_buffer_to_resource(achip->conn_info.connection,
@@ -380,7 +382,8 @@ acpi_gpio_adr_space_handler(u32 function
return AE_BAD_PARAMETER;
}
- for (i = 0; i < agpio->pin_table_length; i++) {
+ length = min(agpio->pin_table_length, (u16)(pin_index + bits));
+ for (i = pin_index; i < length; ++i) {
unsigned pin = agpio->pin_table[i];
struct acpi_gpio_connection *conn;
struct gpio_desc *desc;
--
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